Common Supplement [Melatonin] Shows Concerning Link to Heart Failure (sciencealert.com)

"Among more than 130,000 adults across multiple countries, those who were prescribed melatonin long-term had an 89 percent higher risk of heart failure over five years, and were twice as likely to die from any cause, compared with those not prescribed melatonin."

Well, now I'm kind of glad I'm allergic to melatonin.